# Complex conjugate of a wavefunction or product

#### shounak

Hello,

In the below mentioned equation
the * asterisk sign used, is it the complex conjugate or product?

#### topsquark

Forum Staff
It's the complex conjugate. (You threw me for a moment... I thought you were talking about momentum!) The last two terms represent the overlap of the wavefunctions if they are both in $$\displaystyle A \cup B$$.

-Dan